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@glatten tatea atmt @fitta Letters Patent No. 68,139, dated August 27, 1867.

GRATE POR FURNACES.

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'-ro ALL w'HoM rr' MAY concerns;

Be it known that we, WILLIAM Asn-Luv Winsen and Janus SMITH, both of Liverpool, England, have invented certain new and useful Improvements in Furnace Firc-Grates and we do hereby declare that thc following is a full and exact description of the construction and mode of operation thereof, reference being made I to the shoot of drawings which accompany this, and Vto the lfigures and letters thereon; that is to say- Our inventionrconsists in a .certain novel mode of constructing, arranging, and moving the bars 4and other parts which constitute furnace fire-grates, by which the following desiderata are secured: first, the fuel during combustion, and as it is burnt down, is carried towards the flue leading to the chimney; second, thc spaces for the admission of nir between the bars are maintained in a free and open condition all over the hre-grate; third, the formation of tclinker on tlebars is prevented.` Amongst other results it follows that the fuel is more perfectly consumed and a greater amount of heat given out than in ordinary furnaces, and that the escape of black smoke into the atmosphere is prevented.

' We will describe what we consider the best means of carrying out our invention.

The bars resemble in form those in ordinary use in coal-burning'fire-grates, and are disposed or placed in a horizontal or nenrly-horiontal position, parallel to each other, and either longitudinally or transversely in the furnace. We prefer placing them longitudinally, that is, in length from front to back, and hereinafter we will specify that arrangement. These said bars are made in one or in several lengths, but when they are in more than one length they must be coupled together so as to act as if there were but one length. They rest on bearers in the usual manner, and are provided with side frame pieces when necessary.` Across the ash-pit, and near the front thereof, wc place two drums, hereinafter described, the ends of which rcstlin bearings. These drums are geared together by toothed wheels so that when in 4motion they rotate in opposite dircotionsrmotion being communicated in any convenient way. On one of these drums there is mounted, or there is cast therewith, a wing or protection, which, as the drum rotates, comes into Contact with the ends of the` bars, or with raised portions thereof, and pushes them, en massa, `from front to back of the furnace, and by this motion the fncl resting on thc bars is carried towards the bridge. n some casos, when'the furnaces are very large, more than one wing could bc employed topush the bars backwards in divisions or sections, and when that is 4tliemiode used stationary bars between the divisions or sections might be serviceable. Ou-the other drum there is a number of tappets, Veither fastened thereto or cast therewith, disposed thereon like the helix of a screw7 or irregularly, so that as the drum rotates the tappets-comc into contact with projecting portions of the bars and move them singly, the one after the other, from back .to front ofthc furnace, or several bars are taken forward at a time, care being'takcn that the bars o'n both sides of each shall remain stationary during that time. We preferto move only one bar, `or several widely separated bars at a time, in the motion from hach to front, as it is undesirable that the fucl'shouldbe carried in this direction. Still, two or more bars next each other could be moved. The motion or travel of the bars in a furnace of ordinary length need not exceed` four inches, for the repeated motion will prevent the formation of clinker, and keep the spaces between the bars perfectly free so as to admit air.

The accompanying sheet of drawings contains viewsillustrative of one of our furnacc'rc-grates, (suitable for a Cornish steam-heilen) in combination with a. hoppe'r from which the fuel is carried or fed by the vmotion of the barsi'metion `boing given to operate the part-s by a reciproca-ting connecting-rod.

Figurel Vis a plan view, the hopper being omitted.

Figure 2, a side elevation, the side framepiece being removed.

Figiue, a horizontal section through fic. 1 at A B.

Figure 4 represents the bars turned over, the drums being'in position and Figure 5 a' frontl elevation. l

In lall these views the same letters denote like parts.

a a! @las the bars, here shown made in two lengths, and joined together by projecting pieces Z1, and corres spending sockets. The object in makizigthe bars in two lengths is to prevent twisting and bending, and to allow for expansion. c, the bearers. d, side frame pieces, the outer edges of which are peetinated that the frame may be more readily fitted where there are projecting rivets. e, frame suitable for attaching to the end of a boiler. f, fuel-hopper, secured to e, and provided with sliding-door y," the said door can be balanced by a weight attached to a chain led away from the suspender 7L, over a pulley. For the purpose of regulating the feed of fuel it is only necessary to leave a greater or lesser distance between the bottom of g and the upper surface of the bars a. t', reciprocating-rod from any convenient power connected to the lever framej, whereto the impulse pallet 7c is jointed. When power is not available a lever shipped on to ,7' could be operated by hand. m, a ratchet-wheel secured on the drum n., and 0 a check-pallet- The drum n has fitted thereto a stili` bar, p, and is provided with projecting inclined surfaces q, for the purpose hereinafter mentioned. 1*, theinner drum, provided with tappets s s s2 s3. By the toothed wheels t t the drums n, and 1' are geared together, and are caused to rotate intermittently in opposite directions, the harp pushing the whole backwards at one operation, and the tappets drawing them forwards, in the following order: First by s, the two bars marked @as shown by tig. 5,- by s three bars marked al, by s2 three hars marked a2, and by s3 three bars marked a3. The projecting surfaces g, as they travel round, serve to prevent any but those bars with which ta-ppetsare in-contact from being carried forward. As an illustration, in fig. 5 the hars o3 al ci3 al are prevented from moving forwards until their respective tappets come into contact with them. Where the coal or fuel used is not of a caking character and the fuel is fed in a thin stream, these projections g are not required.

The operation of the several parts of our said ire-gratc is as follows: Reciprocating motion (twenty-four strokes per minuteanswcrs well) given to the rod t', gives an up-and-down motion to t-he lower framej. At each upward stoke of j the pallet 7c causes the ratchet-wheel 'm to make a partial revolution. This motion is given to n, and by the wheels t t to 1', by which means the whole of the bars are iii-st pushed backwards by p, and afterwards drawn forwards in the manner shown on the drawings, or' singly one after the other, or otherwise, as may be desired, the tappcts being disposed on i' so as to produce the required movement.

It will be obvious the fuel-hopper might be dispensed with and the fuel supplied by hand in the ordinary manner, andalthough we prefer to use the hopper described, we do not claim it as of our invention. It will also be obvious that a space between the back end of the bars and thc bridge would be requisite so as--to allow Vincombustible matters to fall into the ash-pit.

Having now described our inventionand particuiarized an arrangement of parts which answers well in practice, we would have it understood that we do not confine ourselves to the exact details shown and described, as many modifications may be made without departingr from the leading features of our invention. What wc claim, is

1. We claim causing two or more of the bars of which a furnace lire-grate is composed to move together pose herein set forth.

claim, in connection-with vthe above, the combination of parts. herein described, consisting of bars .in one direction, and then causing them to move back a less number at a time, substantially as and for the pur-t a, drums 1t r, and their attachments and operating mechanism j c m, or their respectivo equivalents, adapted for causing bars to move, in the manner substantially as herein set forth.

In testimony whereof` we have hereunto set our names in presence of two subscribing witnesses.

WILLIALNI ASHLEY WILSON, JAMES SMITH.

Witnesses: I i

JonN I. Kino, Jenn DAvins. 

